The only ‘obvious’ thing is the Trinity fallacy that so many want to promote. Nails and days in a tomb seem like rather remote ‘things’. The apostles and gospellers gave no recorded significance to them.
Jews do not believe that Jesus’ crucifixion, if it occurred, had any importance. There is nothing mentioned here that is valued by the Jewish heritage. Indeed, they are all more liable to enrage Jews than encourage them.
Is it any more than sentimentality that gives significance to the number of nails? There is no theological significance whatever. The number of nails could have been four, anyway- and was four, imv. Likewise, there is no significance in the number of days in the tomb. It could have been any number- unlike, for instance, the number of baskets of food taken up by the disciples, when the number was everything.
Trinitarianism is neither Jewish nor Christian; it is polytheist. Certain factions approve this teaching because it permits them to demote Jesus, who, as a man, was God, with us, in Christian belief. Iow, he was the manifestation of God, in Christian belief.
Again, Jews give this no significance. There is no indication that there were three seers, other than the presentation of three gifts, or three types of gift. There could have been seventeen of them- and in view of the importance of the event they attended, and the known strong following of seers in Eastern parts, and the ease of travel along a great trade route, there were likely to be at least that many.
No doubt the number three can be found by a simple search. But there will be very few who have any idea what they are looking at, other than a simple number, and if they think they know, they will probably be wrong. The number three, like other numbers, does indeed have significance in the Bible- but it is nothing to do with nails, days or kings, and certainly not polytheism or anything that might be mistaken as polytheism.
Paul wrote that he was ‘determined to know nothing among you, but Christ, and him crucified’. The empty cross is the obvious non-verbal symbol of Christ and Christianity.