Disclaimer: I'm not a native speaker so my grammar may be off. I think it's called Spivak pronouns?
It's a gender-neutral pronoun, that goes like this: he, she – e him, her – em his, her – eir his, hers – eirs It's one of many inventions to replace 'he' and 'she' in a gender-neutral way. I myself am becoming more and more comfortable with just using the singular 'they', but for a long time after playing Agora I was a proponent of Spivak. Its advantage would be that it is clearly singular, while 'they' might throw reader's off who only use it for plural. Of course, 'eir' also throws off peole who haven't heard it before.
