'Thread' in the Bible

if from a thread even to a sandal-thong, yes, if of all that is thine, I take anything ...; that thou mayest not say, I have made Abram rich;

And it came to pass when she brought forth, that one stretched out his hand, and the midwife took it and bound round his hand a scarlet thread, saying, This came out first.

And afterwards came out his brother, round whose hand was the scarlet thread; and they called his name Zerah.