Which tzitzit strings and knots should one look at during Kriat Shema, and what do they symbolize?

Synopsis

The Mechaber specifies looking at the two front tzitzit, which together have ten knots (alluding to the divine name) and sixteen strings plus ten knots totaling twenty-six (the numerical value of God's name YKVK). Later authorities add kabbalistic interpretations.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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