GNU parallel logo

Challenged by @curran

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)

svg.selectAll('g')
    .data(d3.range(9))
    .enter()
    .append('g')
    .attr('transform', d => `translate(${20 + 2*((d+2)%5) - 2*((1-d)%3)}, ${20 + d*15})`)
    .selectAll('rect')
    .data(d3.range(15))
    .enter()
    .append('rect')
    .attr('x', d => d * 20)
      .attr("width", 20)
      .attr("height", 15)
    .attr('fill', d => (d%2) ? 'black':'white')
    .attr('stroke', d => (d%2) ? '#888':'black')

var text = svg.append('text')
    .attr('font-size', 50)
    .attr('font-family', 'sans-serif')
    .attr('transform', 'translate(20,210)')

text.append('tspan').text('GNU ')
    text.append('tspan').text('para').attr('font-weight', 'bold')
    text.append('tspan').text('ll').attr('font-weight', 'bold').attr('font-style', 'italic').attr('dx', -3)
    text.append('tspan').text('el').attr('font-weight', 'bold').attr('dx', 1)

</script>
</body>

https://d3js.org/d3.v4.min.js