A PIPS symbol is something specific to the system, that we've created from scratch.
A gender identity symbol indicates something about the wearer's gender and may imply something about their sex organ as well.
A sexual identity symbol indicates something about the wearer's sex organs. Generally, this should only be used if your gender identity does not make your sex organ clear.
An orientation symbol indicates something about the wearer's sexual and/or romantic orientations. Generally, if no romantic orientation is displayed, you can assume it matches their sexual orientation (eg bisexual implies biromantic unless another romantic orientation symbol is displayed). Also generally, if no sex organ attraction is displayed, you can assume it corresponds to their gender interest (eg. bisexual implies attraction to all genders and all combinations of sex organs).
A lifestyle symbol indicates something about the wearer's ideal lifestyle choices. They may be mandatory passions that they feel like they must have in their life or merely things they are interested in exploring.
A seeking symbol indicates something about what types of relationships the wearer is interested in pursuing. If they are wearing two or more, you can consider them to be interested in any of the options.