- The characters (writing) is in an older form of the Sanskrit language (so I was told), and so is not directly understood or can't be read by the average Thai person. It is also this writing type that is used in the temples and by the monks (at least by the Thai Buddhist monks) for the prayers and religious writings, somewhat the original Sanskrit (I guess).

 

- The blessings are composed of three blocks, that read phonetically sound like next:

 

-- 1) Ar-sarng Phi-su-lo 

-- 2) Uh-bpa Put-pah Nah-mor 

-- 3) Put-tah-yah

 

and this could literally mean:

 

-- 1) To protect your life 

-- 2) So you live forever 

-- 3) To be safe (for -your- safety)

 

Keep in mind that the blessings were made and meant for to be put before a battle or going to war, permanently or temporarily. Some line (2) might as well be for the user and for the sword itself.