JACOB'S STAFF


Meaning of JACOB'S STAFF in English

■ noun a rod with a sliding cursor formerly used for measuring distances and heights.

Origin

C16 (denoting a pilgrim's staff): alluding to St James ( Jacobus in eccles. L.), whose symbols are a pilgrim's staff and a scallop shell.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.