וַיֹּ֤אמֶר יְהוָה֙ אֶל־יְהוֹשֻׁ֔עַ הַיּ֗וֹם גַּלּ֛וֹתִי אֶת־חֶרְפַּ֥ת מִצְרַ֖יִם מֵעֲלֵיכֶ֑ם וַיִּקְרָ֞א שֵׁ֣ם הַמָּק֤וֹם הַהוּא֙ גִּלְגָּ֔ל עַ֖ד הַיּ֥וֹם הַזֶּֽה׃
여호와께서 여호수아에게 이르시되 내가 오늘날 애굽의 수치를 너희에게서 굴러가게 하였다 하셨으므로 그 곳 이름을 오늘까지 길갈이라 하느니라
Sefer HaMiddot
1. A woman who cannot conceive should look at the circumcision knife after the circumcision (t.n. The commentators do not provide any citations for this, so I suggest a hint from Joshua 5:9, where we find that after Joshua had all of Israel circumcised G-d says that here He has removed the disgrace, and we find by the birth of Joseph that a woman not being able to bear children is considered to have an aspect of disgrace, so by looking at the knife that removed disgrace there...).