PHASES OF THE MOON
eight phases · a full cycle of 29.53 days
$1.50
BITS, BYTES, KILOBYTES
two scales · 1000 and 1024 · why a drive looks smaller
$1.50
FLOWCHART SYMBOLS
10 shapes, and one algorithm drawn with them
$1.50
HTTP STATUS CODES
five classes · twenty codes you meet every day
$1.50
ROMAN NUMERALS
seven symbols · ones, tens, hundreds · years
$1.50