The presence of two deltas in a fingerprint indicate?

Whorl pattern.

Explanation: In fingerprint classification, the whorl pattern is one containing two or more deltas which are important in determining the whorl type.

Resembling the Greek letter delta, a delta is the point on a friction ridge at or nearest to the point of divergence of two type lines; as such, a delta is a point in whorl prints that lies within an often triangular, three-pronged or funnel-shaped structure; it is the part of a ridge nearest the point where two parallel ridge lines diverge to flow around the whorls. It is worthy to note it is also the point at which ridge counting begins.

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.