A helpful list of antonyms with the same word length for your everyday variable names:
lo
/hi
up
/dn
rd
/wr
beg
/end
src
/dst
top
/mid
/bot
get
/set
old
/new
⁰min
/max
²new
/del
¹⁰add
/del
¹fix
/var
head
/tail
pred
/succ
prev
/curr
/next
²push
/pull
east
/west
north
/south
large
/small
accept
/reject
source
/target
relative
/absolute
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
😉