Technology Readiness Level is a 1-to-9 scale used to describe the maturity of new technologies under development. It is utilized for project management and funding decisions by many organizations including European Commission. Here are my 2 posts on TRLs:
Technology Readiness Level (TRL) math for innovative SMEs explains TRL, its use in business and innovation management, and its relevance to SME Instrument.
Technology Readiness Level (TRL) put into practice shares a simplified 6-step TRL implementation process and 10 Frequently Asked Questions regarding TRL assessment.