Defensive Signalling Reading Partner’s Signals 3.18.24

When we first learn signalling, it’s easy to just assume everything below a six is a low card and everything above a six is a high card. But, whether a card is a low card or a high card isn’t so simple. A three can be a high card and a nine can be a low card, depending on what’s in partner’s hand. On this hand, partner leads the 8 of clubs. How do you interpret this signal?