A yad (Hebrew: יד) (Yiddish: האַנט), literally, "hand," is a Jewish
ritual pointer, popularly known as a Torah pointer, used by the reader
to follow the text during the Torah reading from the parchment Torah
scrolls. Beyond its practical usage, the yad ensures that the
parchment is not touched during the reading. There are several reasons
for this: handling the parchment renders one ritually impure and the
often-fragile parchment is easily damaged. Moreover, the vellum
parchment does not absorb ink so touching the scroll with fingers will
damage the lettering. While not required when chanting from the
Torah, it is used frequently and is considered a hidur mitzvah
("embellishment of the commandment" of reading the Torah).
Having been a Torah reader for about 30 years, I can verify how easily the ink can fade or smudge if it is rubbed too hard or there is a build-up of liquid or the humidity level in the ark is too high. Too low humidity can cause the parchment to become brittle - a separate problem. Thus, when the Torah is read and people are called up, the rabbi and I encourage people to kiss the Torah on its side in the rolled up area (i.e. - non-written side that's rolled on the wooden scroll, rather than on the words themselves.
While using the pointer is not required, i.e. - you can read by sight or pointing with your finger in the air above the parchment, I find that using the pointer helps both me and the person receiving the Torah honor better follow and locate where I am. This is esp. helpful for people with weakened vision.
If you have a link to the Bengali expression that you found, please edit your question. It is an interesting expression, though, I'm not sure if that can be applied as a universal principle towards everything Jews do. I see the analogy to the Yad, but, Jews touch numerous holy books containing G-d's name with their bare hands.