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

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rose
AF_ROSE - Rose amateur packet radio protocol family
route
kernel packet forwarding database
rp
driver for Comtrol RocketPort Intelligent Serial Port Cards
rr232x
hptrr — HighPoint RocketRAID device driver
rsu
Realtek RTL8188SU/RTL8192SU USB IEEE 802.11b/g/n wireless network device
rsufw
Firmware Module for Realtek driver
rtc
real-time clock
rtwn
Realtek IEEE 802.11 wireless network driver
rtwn_pci
Realtek PCI device glue
rtwn_usb
Realtek USB device glue
rtwnfw
Firmware Module for Realtek Wireless driver
rue
RealTek RTL8150 USB to Fast Ethernet controller driver
rum
Ralink Technology USB IEEE 802.11a/b/g wireless network device
run
Ralink Technology USB IEEE 802.11a/g/n wireless network device
runfw
Firmware Module for Ralink driver
sa
SCSI Sequential Access device driver
safe
SafeNet crypto accelerator
safexcel
Inside Secure SafeXcel-IP-97 security packet engine
savage
S3 Savage video driver
sbni
Granch SBNI12 leased line modem driver
sbp
Serial Bus Protocol 2 (SBP-2) Mass Storage Devices driver
sbp_targ
Serial Bus Protocol 2 (SBP-2) Target Mode devices driver
sc
syscons , sc — the console driver
scbus
CAM — Common Access Method Storage subsystem
scc
driver for Serial Communications Controllers (SCC) devices
sched_4bsd
4.4BSD scheduler
sched_ule
ULE scheduler
screen
pc display interface
screensaver
splash — splash screen / screen saver interface
scsi
CAM — Common Access Method Storage subsystem
sctp
Internet Stream Control Transmission Protocol
sd
driver for SCSI disk drives
sdhci
PCI SD Host Controller bridge driver
sem
POSIX semaphores
send
Kernel side support for Secure Neighbor Discovery (SeND)
ses
SCSI Environmental Services driver
sf
Adaptec AIC-6915 “Starfire” PCI Fast Ethernet adapter driver
sge
Silicon Integrated Systems SiS190/191 Fast/Gigabit Ethernet driver
siba
Sonic Inc. Silicon Backplane driver
siftr
SIFTR — Statistical Information For TCP Research
siis
SiliconImage Serial ATA Host Controller driver
siliconmotion
Silicon Motion video driver
simplebus
ePAPR simple-bus driver
sio
fast interrupt driven asynchronous serial communications interface
sis
SiS 900, SiS 7016 and NS DP83815/DP83816 Fast Ethernet device driver
sisusb
SiS USB video driver
sk
SysKonnect SK-984x and SK-982x PCI Gigabit Ethernet adapter driver
skey
OPIE - One-time Passwords In Everything
smapi
System Management Application Program Interface driver
smartpqi
Microsemi Smart Family SCSI driver
smb
SMB generic I/O device driver
smbios
System Management BIOS
smbus
System Management Bus
smp
SMP — description of the FreeBSD Symmetric Multi-Processor kernel
smsc
USB SMSC LAN9xxx Fast Ethernet driver
sn
Ethernet driver for SMC91Cxx based cards
snd
sound , pcm , snd — FreeBSD PCM audio device infrastructure
snd_ad1816
Analog Devices AD1816 ISA bridge device driver
snd_ak452x
snd_envy24 — VIA Envy24 and compatible bridge device driver
snd_als4000
Avance Logic ALS4000 PCI bridge device driver
snd_atiixp
ATI IXP bridge device driver
snd_cmi
CMedia CMI8338/CMI8738 PCI bridge device driver
snd_cs4281
Crystal Semiconductor CS4281 PCI bridge device driver
snd_csa
Crystal Semiconductor CS461x/462x/4280 PCI bridge device driver
snd_ds1
Yamaha DS-1 PCI bridge device driver
snd_emu10k1
SoundBlaster Live! and Audigy PCI bridge device driver
snd_emu10kx
Creative SoundBlaster Live! and Audigy sound cards device driver
snd_envy24
VIA Envy24 and compatible bridge device driver
snd_envy24ht
VIA Envy24HT and compatible bridge device driver
snd_es137x
Ensoniq AudioPCI ES137x bridge device driver
snd_ess
Ensoniq ESS ISA PnP/non-PnP bridge device driver
snd_fm801
Forte Media FM801 bridge device driver
snd_gusc
Gravis UltraSound ISA bridge device driver
snd_hda
Intel High Definition Audio bridge device driver
snd_hdspe
RME HDSPe bridge device driver
snd_ich
Intel ICH AC'97 and compatible bridge device driver
snd_maestro
ESS Maestro bridge device driver
snd_maestro3
ESS Maestro3/Allegro-1 bridge device driver
snd_mss
Microsoft Sound System ISA PnP/non-PnP bridge device driver
snd_neomagic
NeoMagic 256AV/ZX bridge device driver
snd_sb16
snd_sbc , snd_sb16 , snd_sb8 — Creative Sound Blaster ISA and compatible bridge device driver
snd_sb8
snd_sbc , snd_sb16 , snd_sb8 — Creative Sound Blaster ISA and compatible bridge device driver
snd_sbc
snd_sbc , snd_sb16 , snd_sb8 — Creative Sound Blaster ISA and compatible bridge device driver
snd_solo
ESS Solo-1/1E PCI bridge device driver
snd_spicds
I2S SPI audio codec driver
snd_t4dwave
Trident 4DWave bridge device driver
snd_uaudio
USB audio and MIDI device driver
snd_via8233
VIA Technologies VT8233 bridge device driver
snd_via82c686
VIA Technologies 82C686A bridge device driver
snd_vibes
S3 SonicVibes bridge device driver
snp
tty snoop interface
solver
direct and iterative solver (rheolef-7.2)
solver_abtb
mixed systems solver (rheolef-7.2)
solver_option
direct and iterative solver options (rheolef-7.2)
sound
sound , pcm , snd — FreeBSD PCM audio device infrastructure
speaker
speaker , spkr — console speaker device driver
spigen
SPI generic I/O device driver
spkr
speaker , spkr — console speaker device driver
spl
parameters of the SPL kernel module
splash
splash screen / screen saver interface