hey does anybody know what ths means?

[Mr.Destiny]

i came home today and LNRI was written on my floor and i have no idea what it means i looked through all my books but found nothing

[AlchemicEnchanter]

Where there any irregularities in the text? what was it made of? (ex: blood, salt, etched into the floor..)

I love a good cryptic message. :)