That would be a 3 leaf clover
*folate has told do with the number of leafs coming off of the petiol (leaf stem)
Whorled Phalotaxy is the correct term.
The nodes are where the leaves and branches are attached to the stem. The area between nodes are the internodes.
C99 stacks nodes tightly, ime. You might try moving them away from the light, increasing internode length, if you dont care for it's current growth.
Hmm... If that gal continues with the whorled phalotaxy she could possibly produce about 50% more bud than sis. These plants typically grow out of that but as you have topped it where there are 3 leafs at a single node, you will have 3 main tops rather than the normal two.