"Custom small organic" doesn't refer to a specific term in a scientific or technical context, but it could be interpreted in a couple of different ways:

1. Custom Small Organic Synthesis: This could refer to the customized synthesis of small organic molecules for specific purposes. Organic synthesis involves the creation of organic compounds using chemical reactions. "Custom small organic synthesis" might imply the creation of small organic molecules tailored to particular applications, such as pharmaceuticals, agrochemicals, or materials science.

2. Small-Scale Organic Production: Alternatively, "custom small organic" could refer to the production of organic goods or products on a small scale, possibly in a customized or artisanal manner. This could encompass organic food production, small-scale farming, or the creation of handmade organic products.

Without additional context, it's challenging to provide a more specific interpretation. If you have a particular context or industry in mind, providing additional details could help clarify the meaning.