subscriber

verb | \ səb-ˈskrīb \ | sub·scribe

1. : to sign one's name to a document; also : to give consent or approval by signing one's name : to give consent or approval by signing one's name

   : to sign one's name to a document; also : to give consent or approval by signing one's name : to give consent or approval by signing one's name

2. a : to sign (as a document) with one's own hand in token of consent, obligation, or attestation such witnesses shall subscribe the will in the presence of the testator —West Virginia Code

   b : to pledge (a gift or contribution) by writing one's name with the amount

   c : to sell (stock) by subscription over two million shares have been subscribed

   : to agree to purchase and pay for securities especially of a new offering a right to subscribe to a share of stock —D. Q. Posin