一匕 is read as いっぴ (ippi) and means one dagger.
いっぴ
ippi
ひとり
one person
ひとこと
single word
おととい
day before yesterday
いっさくねん
year before last
いっか
(one's own) style
いちだんらく
one paragraph
いちにんまえ
adult
いちにち
1st day of the month
いちたいいち
one-to-one
いちや
one night
ひととき
two-hour period
いちぐう
corner