to show ("zeigen" is a relative of words like "dictionary" and "index")
to point at ("zeigen auf+Acc" - mostly used in a literal sense. )
We'll talk about all the verbs that take "auf" as a preposition and we'll see if there's some logic somewhere. Also: a few really common phrases with "drauf"
warten auf, freuen auf, achten auf, drauf, drauf sein, drauf kommen, ...