A helpful list of antonyms with the same word length for your everyday variable names:
lo
/hi
up
/dn
rd
/wr
beg
/end
lhs
/rhs
(left/right hand side)src
/dst
top
/mid
/bot
get
/set
old
/new
⁰min
/mid
/max
²new
/del
¹⁰add
/del
¹fix
/var
one
/any
/all
/non
/nil
yay
/nay
head
/tail
less
/more
play
/stop
pred
/succ
prev
/curr
/next
²push
/pull
this
/that
⁰true
/fake
yeah
/nope
east
/west
north
/south
start
/pause
/break
⁰large
/small
lower
/upper
allow
/block
accept
/reject
permit
/refuse
create
/delete
⁰insert
/remove
source
/target
unique
/shared
relative
/absolute
producer
/consumer
positive
/negative
permanent
/temporary
⁰ C++ keyword, cannot be used as an identifier
¹ Python keyword, cannot be used as an identifier
² Python builtin, should not be used as an unqualified identifier, but ok as member
get
/got
/gen
(gen
for generate)width
/depth
length
/height
localhost
/127.0.0.1
😂this->
/other.