Traditionally few combined consonants have a separate symbol. Probably a little shorter version helpful while writing manually.

In computer fonts, it is not possible to write to them. So refer the below image.

You can write all these symbols with the rules/styles discussed in previous sections. i.e.

क + त = क्त
द + य = द्य
द + म = द्म
द + ध = द्ध
द + व = द्व
त + न = त्न
द + द = द्द
न + न = न्न
त + त = त्त
ट + ट = ट्ट
ठ + ठ = ठ्ठ
ड + ड = ड्ड
ढ + ढ = ढ्ढ
ल + ल = ल्ल