Gimmel is the third Hebrew alphabet letter that represents "Chesed" = Kindness among people 
 

Psalms 89:3

(3) For I have said: 'The world is build on kindness/chesed; In the very heavens You establish Your faithfulness/emunah

Gimmel represents the third day of creation, "The seeding day" according to the Book of Genesis

9 And God said, Let the waters under the heaven be gathered together unto one place, and let the dry land appear: and it was so. 

10 And God called the dry land Earth; and the gathering together of the waters called he Seas: and God saw that it was good. 

11 And God said, Let the earth bring forth grass, the herb yielding seed, and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth: and it was so. 

12 And the earth brought forth grass, and herb yielding seed after his kind, and the tree yielding fruit, whose seed was in itself, after his kind: and God saw that it was good. 

13 And the evening and the morning were the third day. 

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Gimmel is also "the third leg of the stool" which is the most powerful geometrical structure, representing stability.