putting lines as signature

Kindly check in normal course how does he makes signature, if he is making signature otherwise than his normal signature, than its not valid.  Adv. khan Mumbai

As Adv.Khan suggested, signature can even be a mark or symbol, as long as it is adapted usually and

consistent. For verification such signature should have been duly recorded for the transactions.

Signature is  the sign usually adopted by the person signing. There is no restriction  to use. Only thing if the signature is clear about the name of the person, he /she has to put  the full name after  it.

I agree with Mr.P.K.Haridasan

There is no restriction on design or style of signature. But if his/her full name is not leggible from the signature than he/she has to write full name under the signature. And as he/she is writing his/her full name, from the hand written full name, it can be proved that he/she has signed the same,