The solution which was adopted was a system of letter code identification. On paperwork, along with such things as name and sex, there is a section for filling in one's particular Type Identification Code (TIC). This code is learned very early as it is even used on standardized testing in elementary schools and is reused over and over all throughout a person's life (much like a social security number).
The codes themselves run as follows: Leg type | Size type | Hand type | Other
To understand how such a code looks, one must know the letter code system. These are thems, dame.
Hand Type (fingers per hand)
important details which could effect medical needs or physical limitations/abilities
These can vary between two individuals of the same species, of course, as there are always some members of species which go up or down a body size level or may have a genetic defect. This prevents a good deal of predjudices and is quite useful when placing adds. Certain jobs may require the D hand type or be too dangerous for a cold-blooded alien to preform due to temperature issues. However, some aliens may be exceptional (an alien with a B hand type applying for one where a D was requested may still be dexterous enough to preform the job) and so, if an employer makes a specific code request and someone who directly contradicts that request still applies, the employer is forced by law to give them a face to face interview to evaluate if they are really capable of the job or not. Some people feel this gives those who apply to jobs against their type an unfair advantage and so the law is under a bit of pressure to be reviewed. Unfortunately there really is no way around it, since the other road seems to lead to rejecting potentially qualified applicants due to something they can't help without giving them a chance to prove themselves.
While these codes are openly and widely used, they almost never come up in casual conversations or casual thought. They are used almost exclusively in paperwork and nothing else as they are meant to give a glimpse of what an applicant may look like without actually meeting them. Unless someone works in a job where they actually have to file these paperworks, the full range of code letters are usually not known by individuals. People tend to memorize their own code for their own use and not bother to think about it any more than that.