Aaronic Benediction & Spock's Vulcan Salute

Numbers 6: 22-27

22 And the LORD spoke unto Moses, saying:

23 'Speak unto Aaron and unto his sons, saying: On this wise ye shall bless the children of Israel; ye shall say unto them:

24 The LORD bless thee, and keep thee;

יְבָרֶכְךָ יְהוָה, וְיִשְׁמְרֶךָ.
Y’-varechecha Adonai v’yish-marechah.

25 The LORD make His face to shine upon thee, and be gracious unto thee;

יָאֵר יְהוָה פָּנָיו אֵלֶיךָ, וִיחֻנֶּךָּ.

Ya-air Adonai panav alechah veechu-nechah.

26 The LORD lift up His countenance upon thee, and give thee peace.

יִשָּׂא יְהוָה פָּנָיו אֵלֶיךָ, וְיָשֵׂם לְךָ שָׁלוֹם.
Yisah Adonai panav alechah v’ya-sem l’chah shalom.

27 So shall they put My name upon the children of Israel, and I will bless them.'

audio and more details about the blessing

Ted Pearce, Aaronic Benediction

a great song to learn the blessing - visit Ted's site

So yes Spock got his vulcan salute from the priestly blessing