Word 50: לפנה"ס (bl)

When you see quotation marks " placed between letters, this usually means a shortening.

We have here word לִפְנֵי, before, and הַסְּפִירָה, the (Christian) era.

Thus, before the Christian era, b.C.e., before Christ.

Pronunciation: lifne ha-s(e)fira

ul