Jewdar

And slap on a gag order if we dare say that these traits triggered our "Jewdar" (my Semitic equivalent of gaydar) and allowed us to identify someone as a fellow Jew.

So she was Jewish. It wouldn't have occurred to me, but Melissa always faulted my Jewdar.

The name Grossman, the physician father, the mention of Florida—my Jewdar went whirring away, strongly suggesting that he could be a member of the tribe.