According to the BCG matrix   a business unit that has a small relative market share in a mature industry with low /slow growth would be referred to as:

According to the BCG Matrix, a business unit that has a small relative market share in a mature industry with low/slow growth would be referred to as a "Dog".

Here's why:

1. The BCG Matrix, also known as the Boston Consulting Group Matrix, is a strategic planning tool that was developed by the Boston Consulting Group. This matrix is used to help a company analyze its business units or product lines to determine which ones to invest in, and which ones to let go.

2. The BCG Matrix consists of four quadrants: Stars, Question Marks, Cash Cows, and Dogs. Each quadrant represents a specific strategic business unit (SBU) with a different growth rate and market share.

3. Stars are SBUs with a high market share in a fast-growing industry. Question Marks are SBUs with a low market share in a high-growth industry. Cash Cows are SBUs with a high market share in a slow-growing industry.

4. Dogs, on the other hand, are SBUs with a low market share in a slow-growing industry. These are typically businesses that were once promising but are now showing signs of decline.

5. Therefore, a business unit that has a small relative market share in a mature industry with low/slow growth would be referred to as a "Dog" according to the BCG Matrix.