What 随 means
“Follow” is the starting point; the phrase sets the exact sense. In Chinese, 随 can also link an action to a rule or change, or leave a choice open. Read the whole phrase: one English word will not fit every use.
Older forms appear in Qin scripts
Older forms appear in Qin slip writing (characters written on narrow strips) and small seal script, an early formal style of writing. The Han-era dictionary 说文解字 gives the traditional form 隨 the sense “follow.” 隨 combines a movement component with a sound component; simplified 随 continues that written lineage.
Combination ideas
3Questions people ask
1Why does 随 show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type 随
随\968FCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.

