Absolute magnitude is a measure of luminosity applied to celestial objects such as stars. In contrast to other measures such as apparent magnitude, absolute magnitude uses a standard distance from Earth as scale, particularly, the distance of exactly 10 parsecs (32.6 light-years). The symbol of absolute magnitude is "M", and in the case of stars, it usually has a measure from −10 to +17.
I believe they are called autosomes or non-sex chromosomes Sex chromosome determine whether an individual is male or female, in humans and other X and Y are the sex chromosomes. Such that female have two X chromosomes and male have an X and a Y. Non-sex chromosomes or autosomes comes in pairs of homologous chromosomes (have the same genes arranged in similar order), thus for all of the genes on the autosomes, the female and males have two copies.