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

Page 3

cd
SCSI CD-ROM driver
cdce
USB Communication Device Class Ethernet (CDC ECM/NCM) driver
cdceem
USB Communication Device Class Ethernet Emulation Model (CDC EEM) driver
ce
driver for synchronous Cronyx Tau-PCI/32 WAN adapters
cfi
cfi , cfid — driver for Common Flash Interface (CFI) NOR flash
cfid
cfi , cfid — driver for Common Flash Interface (CFI) NOR flash
cfiscsi
CAM Target Layer iSCSI target frontend
cfumass
USB device side support for Mass Storage Class Transport
ch
SCSI media-changer (juke box) driver
chromebook_platform
support driver for hardware on various Chromebook models
chvgpio
Intel Cherry View SoC GPIO controller
cirrus
Cirrus Logic video driver
ciss
Common Interface for SCSI-3 Support driver
cloudabi
cloudabi , cloudabi32 , cloudabi64 — CloudABI support
cloudabi32
cloudabi , cloudabi32 , cloudabi64 — CloudABI support
cloudabi64
cloudabi , cloudabi32 , cloudabi64 — CloudABI support
cmx
Omnikey CardMan 4040 smartcard reader device driver
communicator
MPI communicator for C++ (rheolef-7.2)
console_codes
Linux console escape and control sequences
console_ioctl
ioctl_console - ioctls for console terminal and virtual consoles
coretemp
device driver for Intel Core on-die digital thermal sensor
cp
driver for synchronous Cronyx Tau-PCI WAN adapters
cp2112
driver for a USB GPIO and I2C peripheral device
cpuctl
cpuctl pseudo device
cpufreq
CPU frequency control framework
cpuid
x86 CPUID access device
cpuset
confine tasks to processor and memory node subsets
crypto
crypto , cryptodev — user-mode access to hardware-accelerated cryptography
cryptodev
crypto , cryptodev — user-mode access to hardware-accelerated cryptography
cs
Ethernet device driver
csr
distributed compressed sparse matrix (rheolef-7.2)
ctau
driver for synchronous Cronyx Tau WAN adapters
ctl
CAM Target Layer
cue
CATC USB-EL1210A USB Ethernet driver
cx
driver for synchronous/asynchronous Cronyx Sigma WAN adapters
cxgb
Chelsio T3 10 Gigabit Ethernet adapter driver
cxgbe
Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet adapter driver
cxgbev
Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet VF driver
cxl
cxgbe — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet adapter driver
cxlv
cxgbev — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet VF driver
cy
Cyclades Cyclom-Y serial driver
cyapa
Cypress APA trackpad with I2C interface driver
da
SCSI Direct Access device driver
dc
DEC/Intel 21143 and clone 10/100 Ethernet driver
dcons
dumb console device driver
dcons_crom
Configuration ROM stub for dcons(4)
ddb
interactive kernel debugger
de
DEC DC21x4x Ethernet device driver
devctl
device event reporting and device control interface
dht11
gpioths — driver for DHTxx and AM320x temperature and humidity sensors
dht22
gpioths — driver for DHTxx and AM320x temperature and humidity sensors
disarray
distributed container (rheolef-7.2)
disc
software discard network interface
distributor
memory distribution table (rheolef-7.2)
divert
kernel packet diversion mechanism
doc
DOC - (Pilot standard text document) file format
dpms
VESA BIOS DPMS driver
dpt
DPT RAID Controller SCSI driver
ds1307
64 x 8, serial, i2c real-time clock
ds3231
Extremely Accurate i2c-integrated RTC/TCXO/Crystal
dsp56k
DSP56001 interface device
dtaudit
dtrace_audit — A DTrace provider for tracing audit(4) events
dtrace_audit
A DTrace provider for tracing audit(4) events
dtrace_io
a DTrace provider for tracing events related to disk I/O
dtrace_ip
a DTrace provider for tracing events related to the IPv4 and IPv6 protocols
dtrace_lockstat
a DTrace provider for tracing CPU scheduling events
dtrace_proc
a DTrace provider for tracing events related to user processes
dtrace_sched
a DTrace provider for tracing CPU scheduling events
dtrace_sctp
a DTrace provider for tracing events related to the sctp(4) protocol
dtrace_tcp
a DTrace provider for tracing events related to the tcp(4) protocol
dtrace_udp
a DTrace provider for tracing events related to the UDP protocol
dtrace_udplite
a DTrace provider for tracing events related to the UDP-Lite protocol
dummynet
traffic shaper, bandwidth manager and delay emulator
e6060sw
driver for Marvell 88E6060 and 88E6065 fast ethernet switch chip
ed
NE-2000 and WD-80x3 Ethernet driver
edsc
Ethernet discard network interface
efidev
efidev , efirtc — user-mode access to UEFI runtime services
efirtc
efidev , efirtc — user-mode access to UEFI runtime services
ehci
USB Enhanced Host Controller driver
elographics
Elographics input driver
em
Intel(R) PRO/1000 Gigabit Ethernet adapter driver
ena
FreeBSD kernel driver for Elastic Network Adapter (ENA) family
enc
Encapsulating Interface
ep
Ethernet driver for 3Com Etherlink III (3c5x9) interfaces
epair
A pair of virtual back-to-back connected Ethernet interfaces
epgsearch
Searchtimer and replacement of the VDR program menu
esp
Emulex ESP, NCR 53C9x and QLogic FAS families based SCSI controllers
est
Enhanced Speedstep Technology
et
Agere ET1310 10/100/Gigabit Ethernet driver
etherswitch
Ethernet switch framework
evdev
Generic Linux input driver
eventtimers
kernel event timers subsystem
ex
Ethernet device driver for the Intel EtherExpress Pro/10 and Pro/10+
exa
new 2D acceleration architecture for X.Org
exca
helper module for PC Card and CardBus systems
extcap
The extcap interface
fbdev
video driver for framebuffer device
fbdevhw
os-specific submodule for framebuffer device access
fd
floppy disk device
fd
fd , stdin , stdout , stderr — file descriptor files