No other ceremony shall be necessary in swearing than holding up the right hand, but any other form or ceremony may be used which the person to whom the oath is administered professes to believe more binding upon the conscience.
N.H. Rev. Stat. Ann. § 516:19
Swearing
Source
Official source: New Hampshire General Court. Reproduced from public-domain New Hampshire statutes; confirm against the official source for the current text. Not legal advice.