五芒 is read as ごぼう (gobou) and means pentagram.
ごぼう
gobou
い
five
ご
fifty
いつか
5th day of the month
ごぶ
5 parts
いつつ
eight o'clock (old time system)
ごじゅうおん
the Japanese syllabary
ごがつ
May
ごしき
five colors (usu. red, blue, yellow, white and black)
いつえ
five-storied
ごかん
the five senses
さみだれ
early-summer rain