Names of the 24 double handed gestures or Samyuta hastas are laid out in the verse given below :
saMyutahastAH
a~njalishcha kapotashcha karkaTaH svastikastathA //172/
DolAhastaH puShpapuTa utsa~NgaH shivali~NgakaH /
kaTakAvardhanashchaiva kartarIsvastikastathA //173//
shakaTaM sha~Nkhachakre cha sampuTaH pAshakIlakau /
matsyaH kUrmoM varAhashcha garuDo nAgabandhakaH //174//
khaTvA bheruNDa ityete sa~NkhyAtA saMyutAH karAH /
trayoviMshatirityuktAH pUrvagairbharatAdibhiH //175//
PAThabhedaH: khaTvA bheruNDakAkashcha avahitthastathaiva cha/
chaturviMshatirityete karaH shAstra~njnasammataH //175//
That completes 24 double hand gestures)
Anjali- Salutations
KapotaH- Pigeon
KarkaTaH- Crab
SvastikaH- Swastika, auspicious Hindu Symbol
DolahastaH- Swing hands
PushpapuTaH- Heap of flowers
Utsa~NgaH- Friendly or Romantic Hug
Shivali~NgakaH- Symbol for Shiva-linga
KaTakAvardhanaH- Pair of bracelets
Kartari-svastikaH- Pair of scissors
ShakaTam- Deamon Eyes or Cart
Sha~NkhaaH- Counch shell
Chakram- Wheel
SampuTaH- Box or Secret
Pasha- Noose. Bond
KilakaH- Affection
MatsyaH- Fish
KUrmaH- Turtle
VarAHaH- Boar
GaruDaH- Eagle
NAgabandhakaH- Pair of Snakes
KhaTva- Cot
BheruNDa- Mythical 2-headed Bird
AvahitthaH- Bosoms
Further, All these have viniyoga's or usages, which are provided in the "abhinaya darpaNam" - book by NandikeshvaraH