指呼 is read as しこ (shiko) and means beckoning.
しこ
shiko
しさかんこ
pointing and calling (occupational safety method)
しこのかん
hailing distance
しさこしょう
ゆび
finger
しじ
instructions
してい
designation
さしず
directions
さす
to extend one's arm straight ahead (in dance)
しめい
calling on
しすう
index
ゆびきり
pinky swear (i.e. linking little fingers to confirm a promise)
ゆびさす
to point at