Top five strokes — the character
丘 hill.
乓 is one half of the matched pair
乒乓 'ping-pong': both characters are
兵 (soldier) with one diagonal stroke dropped,
乒 missing the right-falling and
乓 missing the left-falling. Indexed under Kangxi #4
丿 (piě) by tradition, despite the missing piě being precisely what defines
乓's silhouette.