Take the 2-minute tour ×  (Not a duplicate of Understanding /dev
and its subdirs and files)  I was browsing around my filesystem
and for the first time I took a second to analyze my /dev
directory. I was surprised by the amount of devices files in it,
and couldn't make sense of all of them:  max@linux-vwzy:/dev> ls
adsp             disk      fd0u1760  initctl  mem
root  sg0       tty    tty21  tty35  tty49  tty62    vboxdrv
vcsa2 audio            dri       fd0u1840  input    mixer
rtc   sg1       tty0   tty22  tty36  tty5   tty63    vboxnetctl
vcsa3 autofs           dsp       fd0u1920  kmem     mixer1
rtc0  sg2       tty1   tty23  tty37  tty50  tty7     vboxusb
vcsa4 block            dvd       fd0u360   kmsg     net
scd0  sg3       tty10  tty24  tty38  tty51  tty8     vcs
vcsa5 bootsplash       dvdrw     fd0u720   log
network_latency     sda   sg4       tty11  tty25  tty39  tty52
tty9     vcs1        vcsa6 bsg              fb0