Section 4 of the manual describes special files (devices).

Page 5

if_gem
gem — ERI/GEM/GMAC Ethernet device driver
if_gif
gif — generic tunnel interface
if_gre
gre — encapsulating network device
if_hme
hme — Sun Microelectronics STP2002-STQ Ethernet interfaces device driver
if_iavf
iavf — Intel Adaptive Virtual Function driver
if_ipheth
ipheth — USB Apple iPhone/iPad tethered Ethernet driver
if_ipsec
IPsec virtual tunneling interface
if_ipw
ipw — Intel PRO/Wireless 2100 IEEE 802.11 driver
if_iwi
iwi — Intel PRO/Wireless 2200BG/2225BG/2915ABG IEEE 802.11 driver
if_iwm
iwm — Intel IEEE 802.11ac wireless network driver
if_iwn
iwn — Intel IEEE 802.11n wireless network driver
if_ix
ixgbe — Intel(R) 10Gb Ethernet driver for the FreeBSD operating system
if_ixgbe
ixgbe — Intel(R) 10Gb Ethernet driver for the FreeBSD operating system
if_ixl
ixl — Intel Ethernet 700 Series Driver
if_jme
jme — JMicron Gigabit/Fast Ethernet driver
if_kue
kue — Kawasaki LSI KL5KUSB101B USB Ethernet driver
if_lagg
lagg — link aggregation and link failover interface
if_le
le — AMD Am7900 LANCE and Am79C9xx ILACC/PCnet Ethernet interface driver
if_lge
lge — Level 1 LXT1001 NetCellerator PCI Gigabit Ethernet adapter driver
if_malo
malo — Marvell Libertas IEEE 802.11b/g wireless network driver
if_mn
mn — Siemens Easy321-R1 E1/T1 device driver
if_mos
mos — Moschip MCS7730/MCS7830/MCS7832 USB Ethernet driver
if_msk
msk — Marvell/SysKonnect Yukon II Gigabit Ethernet adapter driver
if_mwl
mwl — Marvell 88W8363 IEEE 802.11n wireless network driver
if_mxge
mxge — Myricom Myri10GE 10 Gigabit Ethernet adapter driver
if_my
my — Myson Technology Ethernet PCI driver
if_ndis
ndis — NDIS miniport driver wrapper
if_nf10bmac
netfpga10g_nf10bmac — driver for the NetFPGA-10G Embedded CPU Ethernet Core
if_nfe
nfe — NVIDIA nForce MCP Ethernet driver
if_nge
nge — National Semiconductor PCI Gigabit Ethernet adapter driver
if_otus
otus — Atheros AR9170 USB IEEE 802.11a/b/g/n wireless network device
if_pcn
pcn — AMD PCnet/PCI Fast Ethernet device driver
if_ptnet
ptnet — Ethernet driver for passed-through netmap ports
if_ral
ral — Ralink Technology IEEE 802.11a/g/n wireless network device
if_re
re — RealTek 8139C+/8169/816xS/811xS/8168/810xE/8111 PCI/PCIe Ethernet adapter driver
if_rl
rl — RealTek 8129/8139 Fast Ethernet device driver
if_rsu
rsu — Realtek RTL8188SU/RTL8192SU USB IEEE 802.11b/g/n wireless network device
if_rtwn_pci
rtwn_pci — Realtek PCI device glue
if_rtwn_usb
rtwn_usb — Realtek USB device glue
if_rue
rue — RealTek RTL8150 USB to Fast Ethernet controller driver
if_rum
rum — Ralink Technology USB IEEE 802.11a/b/g wireless network device
if_run
run — Ralink Technology USB IEEE 802.11a/g/n wireless network device
if_sbni
sbni — Granch SBNI12 leased line modem driver
if_sf
sf — Adaptec AIC-6915 “Starfire” PCI Fast Ethernet adapter driver
if_sge
sge — Silicon Integrated Systems SiS190/191 Fast/Gigabit Ethernet driver
if_sis
sis — SiS 900, SiS 7016 and NS DP83815/DP83816 Fast Ethernet device driver
if_sk
sk — SysKonnect SK-984x and SK-982x PCI Gigabit Ethernet adapter driver
if_smsc
smsc — USB SMSC LAN9xxx Fast Ethernet driver
if_sn
sn — Ethernet driver for SMC91Cxx based cards
if_ste
ste — Sundance Technologies ST201 Fast Ethernet device driver
if_stf
stf — 6to4 tunnel interface
if_stge
stge — Sundance/Tamarack TC9021 Gigabit Ethernet adapter driver
if_tap
tap , vmnet — Ethernet tunnel software network interface
if_ti
ti — Alteon Networks Tigon I and Tigon II Gigabit Ethernet driver
if_tl
tl — Texas Instruments ThunderLAN Ethernet device driver
if_tun
tun — tunnel software network interface
if_tx
tx — SMC 83c17x Fast Ethernet device driver
if_txp
txp — 3Com 3XP Typhoon/Sidewinder (3CR990) Ethernet interface
if_uath
uath — Atheros USB IEEE 802.11a/b/g wireless network device
if_udav
udav — Davicom DM9601 USB Ethernet driver
if_upgt
upgt — Conexant/Intersil PrismGT SoftMAC USB IEEE 802.11b/g wireless network device
if_ural
ural — Ralink Technology RT2500USB IEEE 802.11 driver
if_ure
ure — RealTek RTL8152/RTL8153 USB to Ethernet controller driver
if_urndis
urndis — USB Remote NDIS Ethernet device
if_urtw
urtw — Realtek RTL8187B/L USB IEEE 802.11b/g wireless network device
if_vcc
cxgbe — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet adapter driver
if_vcxgbe
cxgbe — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet adapter driver
if_vcxl
cxgbe — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet adapter driver
if_vge
vge — VIA Networking Technologies Velocity Gigabit Ethernet adapter driver
if_vlan
vlan — IEEE 802.1Q VLAN network interface
if_vmnet
tap , vmnet — Ethernet tunnel software network interface
if_vmx
vmx — VMware VMXNET3 Virtual Interface Controller device
if_vr
vr — VIA Technologies Rhine I/II/III Ethernet device driver
if_vte
vte — Vortex86 RDC R6040 Fast Ethernet driver
if_vtnet
vtnet — VirtIO Ethernet driver
if_vxlan
vxlan — Virtual eXtensible LAN interface
if_wb
wb — Winbond W89C840F Fast Ethernet device driver
if_wi
wi — Lucent Hermes, and Intersil PRISM IEEE 802.11 driver
if_wpi
wpi — Intel 3945ABG Wireless LAN IEEE 802.11 driver
if_xe
xe — Xircom PCMCIA Ethernet device driver
if_xl
xl — 3Com Etherlink XL and Fast Etherlink XL Ethernet device driver
if_zyd
zyd — ZyDAS ZD1211/ZD1211B USB IEEE 802.11b/g wireless network device
iflib
Network Interface Driver Framework
ifmib
Management Information Base for network interfaces
ig4
Synopsys DesignWare I2C Controller
igmp
Internet Group Management Protocol
iic
I2C generic I/O device driver
iic_gpiomux
driver for I2C mux hardware controlled via GPIO
iicbb
I2C generic bit-banging driver
iicbus
I2C bus system
iicmux
I2C bus mulitiplexer framework
iicsmb
I2C to SMB bridge
iir
Intel Integrated RAID controller and ICP Vortex driver
imcsmb
Intel integrated Memory Controller (iMC) SMBus controller driver
imm
vpo — parallel to SCSI interface driver
inet
Internet protocol family
inet6
Internet protocol version 6 family
initrd
boot loader initialized RAM disk
inputtestdrv
inputtest - An X.Org input driver for testing
intel-virtual-output
Utility for connecting the Integrated Intel GPU to discrete outputs