I think prayer-type actions are allowed. And this is the actual rule:
Section 3 Unsportsmanlike Conduct
Article 1 There shall be no unsportsmanlike conduct. This applies to any act which is contrary to the
generally understood principles of sportsmanship. Such acts specifically include, among others:
(a) Throwing a punch, or a forearm, or kicking at an opponent even though no contact is made.
(b) The use of abusive, threatening, or insulting language or gestures to opponents, teammates, officials,
or representatives of the League.
TAUNTING
(c) The use of baiting or taunting acts or words that engender ill will between teams.
(d) Individual players involved in prolonged or excessive celebrations. Players are prohibited from
engaging in any celebrations while on the ground. A celebration shall be deemed excessive or
prolonged if a player continues to celebrate after a warning from an official.
(e) Two-or-more players engage in prolonged, excessive, premeditated, or choreographed celebrations.
(f) Possession or use of foreign or extraneous object(s) that are not part of the uniform during the game
on the field or the sideline, or using the ball as a prop.
