休符 is read as きゅうふ (kyuufu) and means rest.
きゅうふ
kyuufu
きゅうしふ
rest
きゅうしふをうつ
to put a period to
にぶきゅうふ
half rest
ぜんきゅうしふ
whole note rest
きゅうこう
cancellation (of a lecture, class, etc.)
きゅうかん
suspension of publication
きゅうかんび
newspaper holiday
lying fallow
きゅうせんきょうてい
cease-fire agreement
きゅうせんちたい
demilitarized zone
suspension of sailings
きゅうかんごう
last issue (of a magazine, etc. which has suspended publication)