MNN+@0・

MNN+@0・ (called on the JASRAC database) is Disc 3, Track 9 on the XenobladeX Original Soundtrack. It is split into two parts: the first plays from the start until 2:49, and the second plays from then until the end.

The first part plays in the Ma-non Ship during the day. The second part is a more subdued remix of the first and plays in the Ma-non Ship at night, as well as when the party first meets Kun'luarb during Rescue at the Ensconced Citadel.

Etymology
The 'MNN' in the title is 'Ma-non' with the vowels and hyphen removed. The plus sign may be indicating that the following punctuation is meant to be included in the previous part: the ampersand @ may be taken as an 'a', the numeral 0 may be taken as an 'o', and the central dot ・ may indicate a hyphen. Inserting these into the correct place in 'MNN' recovers 'M@・N0N', or 'Ma-non'. This also aligns with the JASRAC version of the title.