Under the Companies Act, 2013, what term does the Act use for the persons who form a company by putting their names to its memorandum at incorporation?

Section 3(1) of the Companies Act, 2013 speaks of a company being formed by persons 'subscribing' to the memorandum, and section 2(55) treats these subscribers as having agreed to become members. Promoters, defined in section 2(69), need not sign the memorandum at all. Subscribers who are individuals may become the first directors under section 152(1) if the articles name none, but that is a later consequence, not the term for those who sign.