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

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ALTQ
alternate queuing of network packets
CAM
Common Access Method Storage subsystem
CPU_ELAN
AMD Elan 520 CPU support
CPU_SOEKRIS
CPU_ELAN — AMD Elan 520 CPU support
Castor_limits
LCG internal limits  
FDT
fdt — Flattened Device Tree support
GEOM
modular disk I/O request transformation framework
PAE
Physical Address Extensions
Read
read_reading , fread_reading - Read a trace file into a Read structure.  
SCSI
CAM — Common Access Method Storage subsystem
SMP
description of the FreeBSD Symmetric Multi-Processor kernel
SW_WATCHDOG
watchdog — hardware and software watchdog
aac
Adaptec AdvancedRAID Controller driver
aacraid
Adaptec AACRAID Controller driver
acpi
Advanced Configuration and Power Management support
acpi_asus
Asus Laptop Extras
acpi_asus_wmi
Asus Laptop WMI Extras
acpi_dock
Laptop Docking Station device driver
acpi_fujitsu
Fujitsu Laptop Extras
acpi_hp
ACPI extras driver for HP laptops
acpi_hpet
hpet — High Precision Event Timer driver
acpi_ibm
ACPI extras driver for IBM laptops
acpi_panasonic
ACPI hotkey driver for Panasonic laptops
acpi_rapidstart
Intel rapid start technology ACPI driver
acpi_sony
ACPI notebook controller driver for Sony laptops
acpi_thermal
ACPI thermal management subsystem
acpi_toshiba
Toshiba HCI interface
acpi_video
ACPI Video Extensions driver
acpi_wmi
ACPI to WMI mapping driver
ada
ATA Direct Access device driver
adapt
mesh adaptation
adm6996fc
driver for Infineon ADM6996FC fast ethernet switch chip
adv
Advansys ISA/VL/PCI Narrow 8bit SCSI Host adapter driver
adw
Advansys PCI 16bit SCSI Host adapter driver
ae
Attansic/Atheros L2 FastEthernet controller driver
aesni
driver for the AES and SHA accelerator on x86 CPUs
age
Attansic/Atheros L1 Gigabit Ethernet driver
agp
generic interface to the Accelerated Graphics Port (AGP)
agpgart
agp — generic interface to the Accelerated Graphics Port (AGP)
aha
Adaptec SCSI host adapter driver
ahc
Adaptec VL/ISA/PCI SCSI host adapter driver
ahci
Serial ATA Advanced Host Controller Interface driver
ahd
Adaptec PCI/PCI-X Ultra320 SCSI host adapter driver
aibs
ASUSTeK AI Booster ACPI ATK0110 voltage, temperature and fan sensor
aic
Adaptec AIC-6260 and AIC-6360 SCSI driver
aio
asynchronous I/O
aiptek
Aiptek USB Digital Tablet Input Driver for Linux
alc
Atheros AR813x/AR815x/AR816x/AR817x Gigabit/Fast Ethernet driver
ale
Atheros AR8121/AR8113/AR8114 Gigabit/Fast Ethernet driver
alpm
Acer Aladdin 15x3 Power Management controller driver
altera_atse
atse — driver for the Altera Triple-Speed Ethernet MegaCore
altera_avgen
driver for generic Altera Avalon-bus-attached, memory-mapped devices
altera_jtag_uart
driver for the Altera JTAG UART Core
altera_sdcard
driver for the Altera University Program Secure Data Card IP Core
altera_sdcardc
altera_sdcard — driver for the Altera University Program Secure Data Card IP Core
altq
ALTQ — alternate queuing of network packets
amdgpu
AMD RADEON GPU video driver
amdpm
AMD 756/766/768/8111 Power Management controller driver
amdsbwd
device driver for the AMD southbridge watchdog timers
amdsmb
AMD-8111 SMBus 2.0 controller driver
amdsmn
device driver for AMD processor System Management Network
amdtemp
device driver for AMD processor on-die digital thermal sensor
amr
MegaRAID SCSI/ATA/SATA RAID driver
an
Aironet Communications 4500/4800 wireless network adapter driver
aout
kernel support for executing binary files in legacy a.out format
apic
Advanced Programmable Interrupt Controller (APIC) driver
apm
APM BIOS interface
arcmsr
Areca RAID Controller driver
arp
Address Resolution Protocol
asmc
device driver for the Apple System Management Console (SMC)
ata
generic ATA/SATA controller driver
atf-test-case
generic description of test cases
ath
Atheros IEEE 802.11 wireless network driver
ath_ahb
Atheros AHB device glue
ath_hal
Atheros Hardware Access Layer (HAL)
ath_pci
Atheros PCI device glue
ati
ATI video driver
atkbd
the AT keyboard interface
atkbdc
the AT keyboard controller interface
atmsigd.conf
configuration file for the ATM signaling demon
atp
Apple touchpad driver
atrtc
AT Real-Time Clock (RTC) driver
atse
driver for the Altera Triple-Speed Ethernet MegaCore
attimer
i8254 Programmable Interval Timer (AT Timer) driver
audit
Security Event Audit
auditpipe
pseudo-device for live audit event tracking
aue
ADMtek AN986 Pegasus USB Ethernet driver
ax25
AF_AX25 - AX.25 amateur packet radio protocol family
axe
ASIX Electronics AX88x7x/760 USB Ethernet driver
axge
ASIX Electronics AX88178A/AX88179 USB Gigabit Ethernet driver
bce
QLogic NetXtreme II (BCM5706/5708/5709/5716) PCI/PCIe Gigabit Ethernet adapter driver
bcma
Broadcom AMBA Backplane driver
bfe
Broadcom BCM4401 Ethernet Device Driver
bge
Broadcom BCM57xx/BCM590x Gigabit/Fast Ethernet driver
bhnd
Broadcom Home Networking Division interconnect bus
bhnd_chipc
Broadcom Home Networking Division ChipCommon Driver
bhnd_pmu
Broadcom Home Networking Division PMU Driver
bhndb
Broadcom Home Networking Division interconnect bridge driver
bhndb_pci
Broadcom Home Networking Division PCI host bridge driver
bktr
Brooktree Bt848/849/878/879 and Pinnacle PCTV video capture driver