Gen 1:14 And Elohim said, “Let lights come to be in the expanse of the heavens to separate the day from the night, and let them be for signs and appointed times, and for days and years, 15 and let them be for lights in the expanse of the heavens to give light on the earth.” And it came to be so.
sign: a signal, flag, beacon, omen; (properly in relation to time, to come, of the future)
God gives His approval or disapproval via blessings and curses. He never says I give you a sign as My approval.
Well ... you can come up with whatever “name” you want for those tetrads in the past and the situations that accompanied them. I’m less interested in the name, as much as I’m interested in the pattern that has been exhibited.
If you want to use “sign” for those tetrads as described in the various articles, that’s fine with me, as it doesn’t matter much to me as much as what has been happening.